drivers/hwinfo/hwinfo_numaker_rmc.c

/*
 * Copyright (c) 2024 Nuvoton Technology Corporation.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <soc.h>
#include <zephyr/drivers/hwinfo.h>
#include <zephyr/sys/byteorder.h>
#include <string.h>

struct numaker_uid {
	uint32_t id[3];
};

ssize_t z_impl_hwinfo_get_device_id(uint8_t *buffer, size_t length)
{
	struct numaker_uid dev_id;

	SYS_UnlockReg();
	RMC_Open();

	dev_id.id[0] = sys_cpu_to_be32(RMC_ReadUID(0));
	dev_id.id[1] = sys_cpu_to_be32(RMC_ReadUID(1));
	dev_id.id[2] = sys_cpu_to_be32(RMC_ReadUID(2));

	length = MIN(length, sizeof(dev_id.id));
	memcpy(buffer, dev_id.id, length);

	RMC_Close();
	SYS_LockReg();

	return length;
}